Question about Samsung HC-P4752W 47" Rear Projection HDTV-Ready Television

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Do it yourself

Do you have the schematics for this tv
can you explin how to r and r and if you ever need anything about air conditionners let me know
JJ ayoelchico@sbcglobal.net

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Here's a link to the schematic.
-dan

Posted on Jul 26, 2008

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Without knowing the type of liquid, or having a schematic of your TV, it's hard to say. This is only an opinion, so take it for nothing more than that.The most common electronic part to have anything in them are capacitors, the rest just contain smoke and if you let the smoke out you just have to replace them! (If you know what I mean.) Some of the higher capacity caps have oil in them for cooling, I'm not sure your TV would have anything like that in it. So... if you have kids, all I can say is what goes in must come out!Sorry, but this is the best I can do for you with the information at hand.

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1 Answer

No sound from tv with philips HTS8100 THEATER


Hello,

First, check you menu settings for (High Definition Media Interface) HDMI on your TV and on your home theater system, if they are correct then, I have bad news the HDMI port on your TV or on your home theater system has been blown. This is a common and on-going problem with HDMI. The control circuitry is suceptable to stray voltages, which cause the HDMI IC and circuit to malfunction.

I would suggest if it is the HDMI port, having a qualified TV technician troubleshoot the problem and give you an estimate on the cost of repair.

However if you want to try to do this yourself, here is what you will need:

1) schematic of the TV
2) multimeter
3) Oscilloscope (optional)
4) HDMI signal generator (This can be improvised if you have a background in electroniocs)

First unplug the TV and remove the back cover. Then using the schematic find the voltage rail that suppllies voltage to the HDMI port. Plug the tv back in and turn it on. Using the multimeter set to DC volts measure the voltage on the HDMI port control IC and compare it to the schematic values, if they are different within 10% then you have a problem with the IC and it needs to be changed out. If there is no DC voltage difference the look deeper into the circuitry, and follow the path to the main processor, checking the voltages and comparing them to the schematic values. If this proves to be unsuccessful, use the oscilloscope to look at the wave forms (These will be digital pulses) and compare them to the schematic values (they should be as close as possible to the schematic values).
Once you determine that the problem is in the HDMI IC you will need to remove the IC by desoldering it. After the IC is removed clean the area and then replace it with a new HDMI IC.

If you need asistance with the process let me know and I'll try to walk you through it. The best bet however is to call a TV technician.

I hope this helps,

Thank you,

Shuttle83

http://www.electron-age-technologies-llc.com

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2 Answers

Convergence problem


Hello nursecmp,

You have a convergence amplifier problem. Now you have two choices: 1) fix it yourself or 2) Get it fix by a qualified TV repair person. Granted if you choose the latter, you will spend about $200-$500 depending on the shop. So as you stated you would want to do this yourself. OK, I will not get into the problems with this, rather I'll give you the basic procedure and the you can search fixya for a more in depth solution (I'll show you how to do this after the basic instruction on how to replace the Convergence Amplifiers (I rarely give these instructions) Here goes:

1) Get the schematic/service manual for this TV (You will need it because it contains the part numbers and component values you will need for replacement)

2) On the schematic/service manual locate the convergence amplifiers (STK392-110, 120, 150) and the biasing resistors (Write the resistor values down from the schematic)

3) Unplug the TV and remove the rear cover to expose the electronic circuitry.

4) Using the schematic/service manual find the physical location of the two convergence amplifiers (Usually attached to a big metal silver in color heat sink) (Basically it will look like two big black six sided flat modules with a lot of pins on the bottom (18-22 to be exact)).

5) After finding the heat sink and amplifiers remove the screws or the tension bar holding the amplifiers in place.

6) Using a soldering iron and a de-soldering device (either a de-soldering pump or de-soldering wick) remove the solder from the pins of the amplifiers and biasing resistors that protrude from the solder side of the circuit board. (Take into mind that you may have to remove the board in order to do this, use the instructions in the schematic/service manual to do this, and make sure you mark everything you remove to make sure you have a guide as to how to put it back)

7) After removing the solder from the pins off the amplifiers and the biasing resistors, remove the resistors making a list of the value, part number, and location on the board (all of this should be in the schematic/service manual). Then remove the two convergence amplifier modules taking care so as not to damage the circuit board. NOTE: The heat sink compound (the white goopy stuff) may have hardened and caused the module to stick to the heat sink, you will have to gently pry the module away from the heat sink, I have used a light application of isopropyl alcohol to dissolve the heat sink paste.

8) Once the modules are loose from the heat sink, you can gradually remove them from the circuit board.

9) Clean the heat sink off by using the alcohol and a heavy paper towel (remove all of the heat sink paste, and yes this is messy)

At this point you have removed the two convergence amplifier modules and the biasing resistors and cleaned the heat sink.

Now you will have to use your schematic/service manual to find the part locations, values and numbers you will need to replace the old parts I suggest replacing the biasing resistors first.

1) Sort out the resistors you will need and as stated in the schematic/service manual and replace them according to the schematic/service manual locations and part numbers.

2) Solder the components (resistors) in place making sure not to short out anything in the process.

3) Apply heat sink paste to the metal side of the modules one at a time and the put the modules into the circuit board lining up the screw holes of the modules with the screw holes in the heat sink, use the removed screws or tension bar to hold the modules down once in place in the circuit board and on the heat sink.

4) Solder the pins of both amplifier modules to the circuit board, taking care not to short out anything.

5) Reinstall the board to the TV, reconnect all cables removed (DOUBLE CHECK EVERYTHING)


If all went well the convergence amps should be working, and you will need to realign the convergence of your TV, I suggest using the AUTO Convergence feature of your TV (Use the instructions in the schematic/service manual).

All should be good now.

Now these instructions are generic in nature but can be use for a number of Models of Projection TVs.

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1 Answer

Bow in tv


Hello trumpold,

The bad new is the resistor is bad. If it is reading 2 ohms its bad because the rated value is .29 ohms and 5% tolerance. I would venture to say that the convergence amplifiers have gone bad. due to excessive current. Since the deflection and convergence boards work together they might both be defective. I would first suggest that you take the TV to a qualified TV repair shop, to perform the repair, but if you what to do this yourself you will need the following items:

1) Schematic of the TV in question (www.servicemanuals.net or www.manualsparadise.com

2) Signal Generator or use the on-board Signal Generator (look in schematic for usage.

3) Multimeter (for resistance, and voltage readings)

4) soldering iron, solder, and de-soldering tools (solder wick, and de-soldering pump)

With these items you should be able to determine the components you need to change, and remember follow the instructions in the schematic exactly as to board removal.

Before reinstalling the convergence board after changing out the convergence amps and ALL (I maen ALL) biasing resistors, check for solder bridges and shorts, removing them with the solderwick.

I hope this helps

Thank you,

Shuttle83

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1 Answer

THOMSON 40KW413 Rear Projection TV


Hello Perthi,

From what you have said, it can be surmised that a component has suffered a catastrophic thermal event (burnt up).

First I would suggest you get a schematic for the TV (if you plan on doing any work on the set yourself)

If you are not (the do it yourself type) then at least open up the set (powerd off and unplugged) and visually inspect the circuit boards and components to find any signs of thermally damaged (darkened and or burnt) components.

Check for blown fuses, cracks, and holes in components (stuff like this).

Once that is done, write down what happened, and then call a local TV repair shop (if you are not going to do it yourself) and have them make a house call to check your TV. Get an estimate and then decide your next course of action.

Now for my usual warning:

If you have a background in electronics, you know what equipment you will need to troubleshoot this problem, so I don't need to reinvent the wheel in this case, but I would still tell you that you need a schematic to do any proper kind of troubleshooting. If you do not have a background in electronics, please take your set to a qualified TV repair shop or have a qualified TV technician come to your place to examine the TV and give you an estimate of the cost of repair.

Thank you,
I hope this helps,
Shuttle83

Nov 25, 2007 | Projection Televisions

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